On this test case for example https://bugzilla.mozilla.org/attachment.cgi?id=9025942 it takes 10% of the total frame building time. This may or may not be expected, but worth noting since small improvements to this function will add up to a lot of saved CPU time.
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On this test case for example https://kangax.github.io/compat-table/esnext/ it takes 10% of the total frame building time. This may or may not be expected, but worth noting since small improvements to this function could add up to a lot of saved CPU time.